namespace Components {
  export namespace SubComponents {
    export class Test {}
  }
  export class Header {
    constructor() {
      const elem = document.createElement("div");
      elem.innerText = "This is header";
      document.body.appendChild(elem);
    }
  }

  export class Content {
    constructor() {
      const elem = document.createElement("div");
      elem.innerText = "This is Content";
      document.body.appendChild(elem);
    }
  }

  export class Footer {
    constructor() {
      const elem = document.createElement("div");
      elem.innerText = "This is Footer";
      document.body.appendChild(elem);
    }
  }
}
